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Abstract:

An optical lens includes a incident curved surface, a cone-shaped body,
and a emitting curved surface. Light emitted from a light emitting diode
(LED) has a first refraction angle on a first plane and a second
refraction angle on a second plane after passing through the incident
curved surface, the cone-shaped body, and the emitting curved surface.
The first refraction angle is between 105 degrees and 145 degrees, and
the second refraction angle is between 38 degrees and 65 degrees. The
light is asymmetrically distributed on the second plane. Therefore, when
the optical lens is applied to a street lamp, the light utilization on a
road side may be increased.

Claims:

1. An optical lens, applicable for receiving a light emitted from a light
emitting diode (LED), wherein the LED comprises a first optical axis, and
the optical lens comprises: an incident curved surface; a cone-shaped
body; and an emitting curved surface, wherein the incident curved surface
is used for receiving the light, the light has a first refraction angle
on a first plane and a second refraction angle on a second plane after
passing through the incident curved surface, the cone-shaped body, and
the emitting curved surface, the first refraction angle is between 105
degrees and 145 degrees, the second refraction angle is between 38
degrees and 65 degrees, and the light is asymmetrically distributed on
the second plane.

2. The optical lens according to claim 1, wherein the cone-shaped body
comprises a first surface and a second surface, there is a first angle
between the first surface and the second surface, and the first angle is
between 10 degrees and 65 degrees.

3. The optical lens according to claim 2, wherein the incident curved
surface comprises a second incident curved surface, the second incident
curved surface comprises a first curved line, the first curved line
comprises two first end points, there is a second angle between a
connecting line between the first end points and the second surface, and
the second angle is between 30 degrees and 60 degrees.

4. The optical lens according to claim 1, further comprising a lead angle
surface.

5. The optical lens according to claim 4, wherein the lead angle surface
comprises a first line segment, the first line segment comprises two
second end points, there is a third angle between a connecting line
between the second end points and the first optical axis, and the third
angle is between 20 degrees and 50 degrees.

6. The optical lens according to claim 4, wherein the lead angle surface
is a plane or a curved surface.

7. The optical lens according to claim 1, wherein the emitting curved
surface is an M-shaped curved surface, the M-shaped curved surface
comprises a central axis, and the central axis coincides with the first
optical axis.

8. An optical lens plate, applicable to a lamp, wherein the lamp has a
plurality of light emitting diodes (LEDs), each LED comprises a first
optical axis and is used for emitting light, and the optical lens plate
comprises: a substrate; and a plurality of optical lenses, disposed on
the substrate, wherein the optical lenses correspond to the LEDs, each
optical lens comprises an incident curved surface, a cone-shaped body,
and a emitting curved surface, the incident curved surface is used for
receiving the light, the light has a first refraction angle on a first
plane and a second refraction angle on a second plane after passing
through the incident curved surface, the cone-shaped body, and the
emitting curved surface, the first refraction angle is between 105
degrees and 145 degrees, the second refraction angle is between 38
degrees and 65 degrees, and the light is asymmetrically distributed on
the second plane.

9. The optical lens plate according to claim 8, wherein the cone-shaped
body comprises a first surface and a second surface, there is a first
angle between the first surface and the second surface, and the first
angle is between 10 degrees and 65 degrees.

10. The optical lens plate according to claim 9, wherein the incident
curved surface comprises a second incident curved surface, the second
incident curved surface comprises a first curved line, the first curved
line comprises two first end points, there is a second angle between a
connecting line between the first end points and the second surface, and
the second angle is between 30 degrees and 60 degrees.

11. The optical lens plate according to claim 8, wherein the optical lens
further comprises a lead angle surface.

12. The optical lens plate according to claim 11, wherein the lead angle
surface comprises a first line segment, the first line segment comprises
two second end points, there is a third angle between a connecting line
between the second end points and the first optical axis, and the third
angle is between 20 degrees and 50 degrees.

13. The optical lens plate according to claim 11, wherein the lead angle
surface is a plane or a curved surface.

14. The optical lens plate according to claim 8, wherein the emitting
curved surface is an M-shaped curved surface, the M-shaped curved surface
comprises a central axis, and the central axis coincides with the first
optical axis.

Description:

BACKGROUND OF THE INVENTION

[0001] 1. Field of Invention

[0002] The present invention relates to an optical lens and an optical
lens plate, and more particularly to an optical lens and an optical lens
plate capable of achieving asymmetric distribution of light on a second
plane.

[0003] 2. Related Art

[0004] With the enhancement of people's awareness of environmental
protection, various green electronic products have received attention
according to the energy-saving and carbon-reduction effect. Due to
characteristics of small volume, high brightness, long service life, and
low power consumption, light emitting diode (LED) become an outstanding
lighting appliance in the world wide. For example, the LED is used as a
light source of traffic lights and flashlights in daily life. In addition
to the application in traffic lights and flashlights, the LED can also be
applied to street lamps.

[0005] Light emitted from the LED should meet requirements of a specific
light distribution for street lamp lighting. An optical lens plate,
mechanism design and arrangement are used to enable the light emitted
from the LED to meet the requirement for a particular light distribution.
The light distribution is an illuminated range formed by light projected
from a lighting device on a road surface.

[0006] Persons skilled in the art proposed an LED street lamp meeting the
requirement for different light distributions by means of an optical lens
plate or arrangement. But in this method, a combination of more than two
kinds of optical lenses needs to be adopted, and different kinds of
optical lenses need to cooperate with each other in accordance with a
certain ratio to achieve the required light distribution. Therefore,
problems of excessively high cost of mold design and increasing
development and test time due to ratio adjustment exist. Moreover, FIG.
1A is a schematic cross-sectional structural view of an embodiment
wherein a conventional LED street lamp uses an optical lens plate to meet
requirements for different light distributions. In this embodiment, an
LED street lamp 10 includes a plurality of LEDs 12 and an optical lens
plate 14, and the optical lens plate 14 includes a plurality of optical
lenses 16 and a substrate 18. Each optical lens 16 is disposed on the
substrate 18, and the optical lenses 16 correspond to the LEDs 12. light
19 which has the large incident angle emitted from each LED 12 may be
easily lost due to total reflection of the light 19 caused by the forming
thickness requirement of the optical lens plate 14 (that is, the
substrate 10 needs to have a certain thickness), thereby reducing the
light-emitting efficiency of the optical lens plate 14.

[0007] Furthermore, FIG. 1B is a schematic view for illustrating use of an
embodiment of a conventional LED street lamp on a first plane, FIG. 1C is
a schematic view for illustrating use of the embodiment of the
conventional LED street lamp on a second plane, FIG. 1D is a luminous
intensity distribution curve of the embodiment of the conventional LED
street lamp, and FIG. 1E is a schematic view illustrating a relation
between a road side and a non-road side of light utilization of the
embodiment of the conventional LED street lamp. In this embodiment, a
light distribution on the first plane (that is, a dotted line in FIG. 1D,
namely, the light distribution on a Y-Z plane) and a light distribution
on the second plane (that is, the light distribution shown by a solid
line in FIG. 1D, namely, the light distribution on an X-Z plane) of the
LED street lamp are both substantially symmetric light distribution.
However, the utilization of the LED street lamp with a symmetric light
distribution on the road side (that is, a dotted line SS in FIG. 1E) to
that on the non-road side (that is, a solid line HS in FIG. 1E) is about
50% to 50% (for example, one half of the light is projected to the road
surface, and the other half of the light is projected to a building or a
rice field), thereby causing light pollution to the non-road side (for
example, the light projected to the building will interfere with the
quality of human sleep or the light projected to the rice field will
interfere with the growth of paddy rice.).

[0008] In order to solve the problems, the conventional LED street lamp
employs adjustment of the mechanism design (for example, increasing an
elevation angle of the LED street lamp) to meet the requirement for a
specific light distribution. Therefore, problems that the design is
complex and the assembly and production is not easy exist, thereby
increasing the manufacturing cost of the street lamp.

SUMMARY OF THE INVENTION

[0009] Accordingly, the present invention is an optical lens and an
optical lens plate, which can solve problems such as light pollution, low
light utilization, and high manufacturing cost due to a complex design in
the prior art when being applied in a street lamp.

[0010] The present invention provides an optical lens, which is applicable
for receiving light emitted from an LED, wherein the LED comprises a
first optical axis. In an embodiment, the optical lens comprises an
incident curved surface, a cone-shaped body, and an emitting curved
surface. The incident curved surface is used for receiving the light, and
the light has a first refraction angle on a first plane and a second
refraction angle on a second plane after passing through the incident
curved surface, the cone-shaped body, and the emitting curved surface.
The first refraction angle is between 105 degrees and 145 degrees, the
second refraction angle is between 38 degrees and 65 degrees, and the
light is asymmetrically distributed on the second plane.

[0011] In an embodiment of the optical lens, the cone-shaped body
comprises a first surface and a second surface, there is a first angle
between the first surface and the second surface, and the first angle is
between 10 degrees and 65 degrees.

[0012] In an embodiment of the optical lens, the incident curved surface
comprises a second incident curved surface, the second incident curved
surface comprises a first curved line, the first curved line comprises
two first end points, there is a second angle between a connecting line
between the first end points and the second surface, and the second angle
is between 30 degrees and 60 degrees.

[0013] In an embodiment of the optical lens, the optical lens further
comprises a lead angle surface, the lead angle surface may comprises a
first line segment, and the first line segment comprises two second end
points. There is a third angle between a connecting line between the
second end points and the first optical axis, and the third angle is
between 20 degrees and 50 degrees.

[0014] In an embodiment of the optical lens, the emitting curved surface
is an M-shaped curved surface, the M-shaped curved surface comprises a
central axis, and the central axis coincides with the first optical axis.

[0015] The present invention provides an optical lens plate, which is
applicable to a lamp, the lamp has a plurality of light emitting diodes
(LEDs), each LED comprises a first optical axis and is used for emitting
light. In an embodiment, the optical lens plate comprises a substrate and
a plurality of optical lenses, each optical lens is disposed on the
substrate, and the optical lenses correspond to the LEDs. Each optical
lens comprises an incident curved surface, a cone-shaped body, and a
emitting curved surface. The incident curved surface is used for
receiving the light, and the light has a first refraction angle on a
first plane and a second refraction angle on a second plane after passing
through the incident curved surface, the cone-shaped body, and the
emitting curved surface. The first refraction angle is between 105
degrees and 145 degrees, the second refraction angle is between 38
degrees and 65 degrees, and the light is asymmetrically distributed on
the second plane.

[0016] In an embodiment of the optical lens plate, the cone-shaped body
comprises a first surface and a second surface, there is a first angle
between the first surface and the second surface, and the first angle is
between 10 degrees and 65 degrees.

[0017] In an embodiment of the optical lens plate, the incident curved
surface comprises a second incident curved surface, the second incident
curved surface comprises a first curved line, and the first curved line
comprises two first end points. There is a second angle between a
connecting line between the first end points and the second surface, and
the second angle is between 30 degrees and 60 degrees.

[0018] In an embodiment of the optical lens plate, the optical lens
further comprises a lead angle surface, the lead angle surface may
comprises a first line segment, and the first line segment comprises two
second end points. There is a third angle between a connecting line
between the second end points and the third optical axis and is between
20 degrees and 50 degrees.

[0019] In an embodiment of the optical lens plate, the emitting curved
surface is an M-shaped curved surface, the M-shaped curved surface
comprises a central axis, and the central axis coincides with the first
optical axis.

[0020] With the optical lens and the optical lens plate of the present
invention, the second refraction angle on the second plane is changed
through adjustment of a relative relation between the incident curved
surface, the cone-shaped body and the design of the cone-shaped body.
With the design of the lead angle surface, the utilization of the light
is increased. Through adjustment of a relative relation between the light
guide angle and the LED and a relative relation between the incident
curved surface and the emitting curved surface, the first refraction
angle on the first plane is changed. The optical lens plate of the
present invention is applicable to a lamp, wherein an asymmetric light
intensity distribution is achieved through the design of a single type of
optical lens. Therefore, the luminous intensity distribution curve of the
optical lens and the optical lens plate of the present invention has an
asymmetric light distribution, so that the problems such as light
pollution, low light utilization, and high manufacturing cost due to a
complex design in the prior art can be solved when the optical lens and
the optical lens plate of the present invention are applied to a street
lamp.

BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will become more fully understood from the
detailed description given herein below for illustration only, and thus
are not limitative of the present invention, and wherein:

[0022] FIG. 1A is a schematic cross-sectional structural view of an
embodiment in which a conventional LED street lamp uses a lens plate to
meet requirements for different light distribution;

[0023] FIG. 1B is a schematic view for illustrating use of an embodiment
of a conventional LED street lamp on a first plane;

[0024] FIG. 1C is a schematic view for illustrating use of the embodiment
of the conventional LED street lamp on a second plane;

[0025] FIG. 1D is a luminous intensity distribution curve of the
conventional LED street lamp according to an embodiment;

[0026] FIG. 1E is a schematic view illustrating a relation between a road
side and a non-road side of light utilization of the embodiment of the
conventional LED street lamp;

[0027] FIG. 2A is a schematic three-dimensional structural view of an
embodiment of an optical lens plate of the present invention;

[0028]FIG. 2B is a schematic cross-sectional structural view along line
2B-2B of FIG. 2A;

[0029]FIG. 2C is a schematic structural cross-sectional view along line
2C-2C of FIG. 2A;

[0030]FIG. 3A is a schematic structural view of an embodiment wherein the
optical lenses board in FIG. 2B is applied to a lamp;

[0031]FIG. 3B is a schematic structural view of an embodiment wherein the
optical lens plate in FIG. 2C is applied to a lamp;

[0032] FIG. 4 is a schematic view of a first refraction angle and a second
refraction angle of an embodiment of the optical lens in FIG. 2A;

[0033] FIG. 5A is a luminous intensity distribution curve in which a first
angle in FIG. 3A is 10 degrees;

[0034] FIG. 5B is a luminous intensity distribution curve in which the
first angle in FIG. 3A is 25 degrees;

[0035]FIG. 5C is a luminous intensity distribution curve in which the
first angle in FIG. 3A is 40 degrees;

[0036] FIG. 5D is a luminous intensity distribution curve in which the
first angle in FIG. 3A is 60 degrees;

[0037]FIG. 5E is a luminous intensity distribution curve in which the
first angle in FIG. 3A is 65 degrees;

[0038]FIG. 6A is a luminous intensity distribution curve in which a
second angle in FIG. 3A is 30 degrees;

[0039] FIG. 6B is a luminous intensity distribution curve in which the
second angle in FIG. 3A is 35 degrees;

[0040]FIG. 6C is a luminous intensity distribution curve in which the
second angle in FIG. 3A is 60 degrees;

[0041]FIG. 7A is a schematic structural view of a first embodiment of an
optical lens of the present invention;

[0042]FIG. 7B is a schematic structural view of a second embodiment of
the optical lens of the present invention;

[0043]FIG. 7C is a schematic structural view of a third embodiment of the
optical lens of the present invention;

[0044]FIG. 8A is a luminous intensity distribution curve of the optical
lens in FIG. 7A;

[0045] FIG. 8B is a luminous intensity distribution curve of the optical
lens in FIG. 7B;

[0046]FIG. 8C is a luminous intensity distribution curve of the optical
lens in FIG. 7C;

[0047]FIG. 9 is a schematic structural views of another embodiment in
which the optical lens plate of the present invention is applied to a
lamp;

[0048] FIG. 10A is a schematic structural view of a fourth embodiment of
the optical lens of the present invention;

[0049] FIG. 10B is a schematic structural view of a fifth embodiment of
the optical lens of the present invention;

[0050] FIG. 10C is a schematic structural view of a sixth embodiment of
the optical lens of the present invention;

[0051] FIG. 11A is a luminous intensity distribution curve of the optical
lens in FIG. 10A;

[0052] FIG. 11B is a luminous intensity distribution curve of the optical
lens in FIG. 10B; and

[0053] FIG. 11C is a luminous intensity distribution curve of the optical
lens in FIG. 10C.

DETAILED DESCRIPTION OF THE INVENTION

[0054] FIG. 2A is a schematic three-dimensional structural view of an
embodiment of an optical lens plate of the present invention, and FIG. 2B
is a schematic cross-sectional structural view along line 2B-2B of FIG.
2A. Referring to FIGS. 2A and 2B, in this embodiment, an optical lens
plate 200 comprises a substrate 202 and thirty optical lenses 204,
wherein the thirty optical lenses 204 are disposed on the substrate 202
in a 5×6 array (that is, a number of the optical lenses 204
disposed along a second axial direction Y is 5, and a number of the
optical lenses 204 disposed along a first axial direction X is 6), but
this embodiment is not intended to limit the present invention. That is,
the number and the arrangement of the optical lenses 204 can be adjusted
as required. Each optical lens 204 comprises an incident curved surface
206, a cone-shaped body 208, and an emitting curved surface 210. The
emitting curved surface 210 may be, but not limited to, an elliptical
curved surface (referring to FIG. 2C, which is a schematic
cross-sectional view along line 2C-2C of FIG. 2A). That is to say, the
emitting curved surface 210 may also be an M-shaped curved surface, and
the details will be described below.

[0055]FIG. 3A is a schematic structural view of an embodiment in which
the optical lenses board in FIG. 2B is applied to a lamp, and FIG. 3B is
a schematic structural view of an embodiment in which the optical lens
plate in FIG. 2C is applied to a lamp. Referring to FIGS. 2B and 2C, in
this embodiment, a lamp 50 comprises a circuit board 52 and an optical
lens plate 200, wherein the optical lens plate 200 is disposed on the
circuit board 52. The circuit board 52 may have thirty LEDs 54. Each
optical lens 204 may correspond to each LED 54, that is, the lenses 204
can correspond to the LEDs 54 in a one-to-one relation, but this
embodiment is not intended to limit the present invention. Each LED 54 is
used for emitting light 60 and comprises a first optical axis 56. The
incident curved surface 206 is used for receiving the light 60.

[0056] Since each of the optical lenses 204 in the optical lens plate 200
may has the same design, a single optical lens 204 is taken as an example
for description. FIG. 4 is a luminous intensity distribution curve of an
embodiment of the optical lens in FIG. 2A. In FIG. 4, the center of a
circle is a position where a light source (the LED 54) is located, a
concentric arc 40 represents two thirds of a maximum light intensity 42
of the light 60 on a second plane (that is, an X-Z plane) after the light
60 passes through the optical lens 204, and radial lines represent an
angle with a vertical line 44 passing through the light source (for
example, 0, 10, 20, 30, 40, 50, 60, 70, 80, and 90 degrees in FIG. 4). A
first refraction angle 92 is an angle between a line connecting the
center of the circle with a maximum luminous intensity at the right side
of the vertical line 44 and another line connecting the center of the
circle with a maximum luminous intensity at the left side of the vertical
line 44 in the light intensity distribution on the first plane (that is,
a dotted line in FIG. 4, namely, a Y-Z plane), and a second refraction
angle 94 is an angle formed by the light intensity distribution of the
light 60 on the second plane (that is, a solid line in FIG. 4, namely, an
X-Z plane) and the concentric arc 40 at the right side of the vertical
line 44, that is, an angle of the luminous intensity distribution on the
second plane greater than two thirds of the maximum light intensity 42 at
the right side of the vertical line 44.

[0057] The relative relation among the incident curved surface 206, the
cone-shaped body 208, and the emitting curved surface 210 may influence
the first refraction angle 92 of the light 60 on the first plane (that
is, the Y-Z plane) and the second refraction angle 94 of the light 60 on
the second plane (that is, the X-Z plane), and the details will be
described later.

[0058] Referring to FIG. 3A, the cone-shaped body 208 comprises a first
surface 212 and a second surface 214, wherein there is a first angle
θ1 between the first surface 212 and the second surface 214. The
first angle θ1 may be between 10 degrees and 65 degrees (that is,
10° θ1 65°), so that the light intensity distribution
of the light 60 on the second plane (that is, the X-Z plane) is
asymmetric. FIGS. 5A, 5B, 5C, 5D, and 5E are luminous intensity
distribution curves in which the first angle in FIG. 3A is 10 degrees, 25
degrees, 40 degrees, 60 degrees, and 65 degrees respectively. Different
first angles θ1 correspond to different first refraction angles 92
and different second refraction angles 94, and detailed results are shown
in Table 1.

[0059] It can be known form Table 1 that, when the first angle θ1
becomes larger, the second refraction angle 94 of the light 60 after the
light 60 passes through the optical lens 204 increases accordingly. When
the optical lens 204 is applied to a street lamp, since the second
refraction angle 94 is the distribution of the light 60 at the road side,
an optical lens 204 having a larger first angle θ1 can project the
light 60 to a wider road area. In other words, the optical lens 204
having the larger first angle θ1 is applicable to a street lamp for
multilane roads.

[0060] Moreover, referring to FIG. 3A, the incident curved surface 206
further comprises a first incident curved surface 216 and a second
incident curved surface 218, wherein the second incident curved surface
comprises a first curved line 70. The first curved line 70 comprises two
first end points H and K. There is a second angle θ2 between a
connecting line 72 between the first end points H and K and the second
surface 214.

[0061] The second angle θ2 may be greater than or equal to 30
degrees and less than or equal to 60 degrees (that is, 30°
θ2 60°), so that the luminous intensity distribution of the
light 60 on the second plane (that is, the X-Z plane) is asymmetric.
FIGS. 6A, 6B, and 6C are luminous intensity distribution curves in which
the second angle in FIG. 3A is 30 degrees, 35 degrees and 60 degrees
respectively. Different second angles θ1 correspond to different
first refraction angles 92 and different second refraction angles 94, and
detailed results are shown in Table 2.

[0062] It can be known form Table 2 that, when the second angle θ2
becomes larger, the second refraction angle 94 of the light 60 after the
light 60 passes through the optical lens 204 decreases accordingly. When
the optical lens 204 is applied to a street lamp, since the second
refraction angle 94 is the luminous intensity distribution of the light
60 at the road side, an optical lens 204 having a smaller second angle
θ1 can project the light 60 to a wider road area. In other words,
the optical lens 204 having the smaller second angle θ1 is
applicable to the street lamp for multilane roads.

[0063] Referring to FIG. 3B, the optical lens 204 further comprises a lead
angle surface 220. In this embodiment, the lead angle surface 220 may be
a plane, so that after passing through the lead angle surface 220, the
large-angle light 60 (for example, the light 60 with an angle between the
light 60 and the first optical axis 56 of 85-90 degrees) can be emitted
out from the optical lens 204 via the emitting curved surface 210,
thereby increasing the utilization of the light 60, but this embodiment
is not intended to limit the present invention, that is, the lead angle
surface 220 may also be a curved surface.

[0064] Moreover, the lead angle surface 220 comprises a first line segment
222, in which the first line segment 222 comprises two second end points
J and L. There is a third angle θ3 between a connecting line 74
between the second end points J and L and the first optical axis 56. In
this embodiment, since the lead angle surface 220 is a plane, the first
line segment 222 coincides with the connecting line 74 between the second
end points J and L, but this embodiment is not intended to limit the
present invention. The third angle θ3 may be greater than or equal
to 20 degrees and less than or equal to 50 degrees (that is, 20°
θ3 50°), so that the light 60 is emitted out from the
optical lens 204, thereby increasing the utilization of the light 60.
Different third angles θ3 correspond to different relative light
utilization, and detailed results are shown in Table 3.

[0065] It can be known form Table 3 that, when the third angle θ3
becomes larger, the relative utilization of the light 60 after the light
60 passes through the optical lens 204 increases accordingly.

[0066] Furthermore, the relative relation between the incident curved
surface 206 and the emitting curved surface 210 influences the range of
the first refraction angle 92 of the light 60 on the first plane (that
is, the Y-Z plane). FIGS. 7A, 7B, and 7C are schematic structural views
of a first, a second, and a third embodiment of the optical lens of the
present invention respectively. It can be found from FIGS. 7A, 7B, and 7C
that, the difference between the three optical lenses lies in different
relative distances between the incident curved surface 206 and the
emitting curved surface 210, wherein the relative distance between the
incident curved surface 206 and the emitting curved surface 210 in FIG.
7A is larger than that in FIG. 7B, and the relative distance between the
incident curved surface 206 and the emitting curved surface 210 in FIG.
7B is larger than that in FIG. 7C. The relative distance is a shortest
distance between the incident curved surface 206 and the emitting curved
surface 210.

[0067] The optical lens 204 may influence the luminous intensity
distribution of the light 60 after the light 60 passes through the
optical lens 204 with the different relative distances between the
incident curved surface 206 and the emitting curved surface 210. FIGS.
8A, 8B, and 8C are luminous intensity distribution curves of the optical
lens in FIGS. 7A, 7B, and 7C respectively. The optical lenses 204 of the
first embodiment, the second embodiment and the third embodiment have
different first refraction angles 92 and different second refraction
angles 94 respectively, and detailed results are shown in Table 4.

[0068] It can be known from Table 4 that, as the relative distance between
the incident curved surface 206 and the emitting curved surface 210
decreases, the first refraction angle 92 of the light 60 on the first
plane (that is, the Y-Z plane) becomes larger. When the optical lens 204
is applied to a street lamp, since the first refraction angle 92 is the
luminous intensity distribution of the light 60 in a length direction of
the road, so that an optical lens 204 having a shorter relative distance
between the incident curved surface 206 and the emitting curved surface
210 can project the light 60 to a longer road length, so as to increase
an interval between two adjacent street lamps arranged in a second axial
direction (that is, a Y direction), thereby decreasing the number of the
street lamps arranged.

[0069] In the above embodiments, the emitting curved surface 210 is the
wlliptical curved surface, but the emitting curved surface 210 may also
be an M-shaped curved surface. FIG. 9 is a schematic structural view of
another embodiment in which an optical lens plate of the present
invention is applied to a lamp. In this embodiment, the M-shaped curved
surface (that is, the emitting curved surface 210) comprises a central
axis 224, wherein the central axis may coincide with the first optical
axis 56, but this embodiment is not intended to limit the present
invention.

[0070] FIGS. 10A, 10B, and 10C are schematic structural views of a fourth
embodiment, a fifth embodiment and a sixth embodiment of the optical lens
of the present invention respectively. It can be found from FIGS. 10A,
10B, and 10C that, the difference between the three optical lenses lies
in different relative distances between the incident curved surface 206
and the emitting curved surface 210, and the emitting curved surfaces 210
in the FIGS. 10A, 10B, and 10C are the M-shaped curved surfaces. The
relative distance is a shortest distance between the incident curved
surface 206 and the emitting curved surface 210.

[0071] The optical lens 204 may influence the luminous intensity
distribution of the light 60 after the light 60 passes through the
optical lens 204 with the different relative distances between the
incident curved surface 206 and the emitting curved surface 210. FIGS.
11A, 11B, and 11C are luminous intensity distribution curves of the
optical lenses in FIGS. 10A, 10B, and 10C respectively. The optical
lenses 204 of the fourth embodiment, the fifth embodiment, and the sixth
embodiment have different first refraction angles 92 and different second
refraction angles 94 respectively, and detailed results are shown in
Table 5.

[0072] It can be known from Table 5 that, as the relative distance between
the incident curved surface 206 and the emitting curved surface 210
decreases, the first refraction angle 92 of the light 60 on the first
plane (that is, the Y-Z plane) becomes larger. When the optical lens 204
is applied to a street lamp, since the first refraction angle 92 is the
luminous intensity distribution of the light 60 in a length direction of
the road, so that an optical lens 204 having a shorter relative distance
between the incident curved surface 206 and the emitting curved surface
210 can project the light 60 to a longer road length, so as to increase
an interval between two adjacent street lamps arranged in a second axial
direction (that is, a Y direction), thereby decreasing the number of the
street lamps arranged.

[0073] With the optical lens and the optical lens plate of the present
invention, through the design of a first angle, the luminous intensity
distribution of light passing through an optical lens on a second plane
may be asymmetric. Through the design of a second angle, the luminous
intensity distribution of light passing through the optical lens on the
second plane may be asymmetric. Through the design of a lead angle
surface and a third angle, the utilization of the light increases.
Through the adjustment of a relative distance between a incident curved
surface and a emitting curved surface, the first refraction angle of the
light on the first plane is changed. The optical lens plate of the
present invention is applicable to a lamp, wherein an asymmetric luminous
intensity distribution is achieved through the design of a single type of
optical lens. Therefore, the luminous intensity distribution curve of the
light after passing through the optical lens and the optical lens plate
of the present invention is asymmetric, and the problems such as light
pollution, low light utilization, and high manufacturing cost due to the
complex design in the prior art can be solved, when being applied to a
street lamp. When the second refraction angle of the optical lens is
larger, the optical lens is more applicable in street lamps for multilane
road lighting.